diff --git a/skeletons/constr_CHOICE.c b/skeletons/constr_CHOICE.c
index 5a1e0d3..6b69942 100644
--- a/skeletons/constr_CHOICE.c
+++ b/skeletons/constr_CHOICE.c
@@ -445,7 +445,7 @@
 }
 
 ber_tlv_tag_t
-CHOICE_outmost_tag(asn_TYPE_descriptor_t *td, const void *ptr, int tag_mode, ber_tlv_tag_t tag) {
+CHOICE_outmost_tag(const asn_TYPE_descriptor_t *td, const void *ptr, int tag_mode, ber_tlv_tag_t tag) {
 	asn_CHOICE_specifics_t *specs = (asn_CHOICE_specifics_t *)td->specifics;
 	int present;
 
@@ -458,7 +458,7 @@
 	present = _fetch_present_idx(ptr, specs->pres_offset, specs->pres_size);
 
 	if(present > 0 || present <= td->elements_count) {
-		asn_TYPE_member_t *elm = &td->elements[present-1];
+		const asn_TYPE_member_t *elm = &td->elements[present-1];
 		const void *memb_ptr;
 
 		if(elm->flags & ATF_POINTER) {